* {
    padding: 0;
    margin: 0;
    list-style: none;
    box-sizing: border-box;
  }
  body,html,.App,#root{
    width: 100%;
    height: 100%;
  }
  .home{
    width: 100%;
    height: 100%;
    header{
      height: 55px;
      line-height: 55px;
      background-color: skyblue;
      h2{
        color: #fff;
        padding-left: 15px;
      }
    }
    main{
     display: flex;
     height: 680px;
     .left{
      width: 20%;
      height: 100%;
      background-color: rgba(5, 3, 3, 0.5);
      a{
        color: #fff;
        height: 50px;
        line-height: 50px;
        text-align: center;
        display: block;
      }
      .active{
        background-color: #f2f2f2;
        color: #000;
      }
     }
     .right{
       flex: 1;
     }
    }
  }
 